Apex domains cannot have CNAME records.
Question and response
Question
dig shindan-shi.org. NS
Answer
shindan-shi.org. 5 NS ns-1048.awsdns-03.org.
shindan-shi.org. 5 NS ns-356.awsdns-44.com.
shindan-shi.org. 5 NS ns-360.awsdns-45.com.
shindan-shi.org. 5 NS ns-597.awsdns-10.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0